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Hi Bill, the / indicates % of range. In this case, you have the range set to 40 and the TOL field to 2/ plus 0.4/, which is 2% of range plus 0.4% of range, or 0.8 V plus 0.16 V (+/- 0.96 V). Since the nominal value is 35 V, your lower limit is 34.04 V and your upper limit is 35.96 V as long as you did not change other settings in MET/CAL which affect default tolerance calculation behavior.